AA 3890 then UA 5191 at O'Hare
Sioux Falls → Chicago → Lancaster
Timetable, Chicago time
16:40AA 3890 from Sioux Falls at the gate
08:50UA 5191 to Lancaster leaves the gate
16 h 10 apart on the timetable, overnight
UA 5191 leaves 16 h 10 after AA 3890 arrives on the timetable: more than half a day, so not a connection we count.